But sound needs vibration, and muscle contraction is a relatively smooth, slow process. It generates almost no audible noise. If you could stand inside a healthy heart during a beat, you wouldn’t hear a "crunch" or a "squeeze." You’d hear... silence, followed by chaos.
As the ventricles finish squeezing, the pressure inside them drops rapidly. The blood that was just blasted into the arteries (the lungs and body) suddenly wants to rush backward into the heart. It’s like a wave hitting a seawall. what produces the lub dub heart sounds
In fact, your heart is mostly silent during the actual pump. But sound needs vibration, and muscle contraction is
And the tiny gap between the Lub and the Dub? That’s —the actual pumping phase. But again, pumping is silent. So the only reason we hear two distinct noises is because we are listening to the boundaries of the pump: the valves slamming at the start and the valves snapping at the finish. Part 5: The Party Trick (Breathing and Splitting) Here’s where it gets weird enough to impress your friends. If you listen to a child’s heart with a stethoscope and tell them to take a deep breath, the "Dub" suddenly turns into "Du-ub." It splits into two distinct sounds. silence, followed by chaos